This one-day lecture, illustrated with extensive photographs from Dr. Jack P. Hailman's travels, explores the development of "America's best idea." The thesis is that the notion of a national park is somewhat like America's other great idea, the U.S. Constitution. Follow burgeoning park concepts from pre-Yellowstone places such as the Lake District in England, Hot Springs in Arkansas, and Yosemite Valley in California, to the modern roadless wildernesses of North Cascades in Washington and Gates of the Arctic in Alaska, as well as many milestone parks along the way.